.head {
    background-color: rgb(22, 46, 68);
    width: 100%;
    position:sticky;
    top: 0;
    z-index:999;
    .container {
      display: flex;
      height: 50px;
      justify-content: space-between;
      padding: 0;
      align-items: center;
  
      .big {
        display: none;
        width: 30px;
        height: 30px;
        border: 1px solid rgb(255, 255, 255);
        border-radius: 5px;
        margin-left: 20px;
        cursor: pointer;
        span {
          display: block;
          width: 24px;
          height: 2px;
          background-color: #fff;
        }
      }
      .container-right {
        height: 100%;
        display: flex;
        padding-right: 20px;
        img {
          width: 50px;
        }
      }
      .container-left {
        ul {
          list-style: none;
          display: flex;
          padding: 0;
          height: 50px;
          align-items: center;
          font-size: 18px;
          font-weight: bold;
          margin-bottom: 0;
          li {
            display: block;
            padding: 0 10px;
            height: 50px;
            line-height: 50px;
            cursor: pointer;
            box-sizing: border-box;
            transition: all 0.1s;
            a {
              color: white;
              text-decoration: none;
            }
          }
          li:hover {
            background-color: rgba(255, 255, 255, 0.3);
            border-top: 2px solid red;
          }
        }
      }
    }
    .menu {
      display: none;
      width: 100%;
      ul {
        list-style: none;
        padding-left: 0;
        li {
          height: 50px;
          margin: 0 20px;
          transition: all 0.3s;
          line-height: 50px;
          a {
            text-decoration: none;
            color: white;
          }
        }
        li:hover {
          background-color: #ff5252;
        }
      }
    }
    .container::after,
    .container::before {
      display: none;
    }
  }
  
  
  @media screen and (max-width: 768px) {
    .head {
      .container {
        .container-left {
          display: none;
        }
        .big {
          display: flex;
          flex-wrap: wrap;
          align-content: space-around;
          justify-content: center;
        }
      }
    }
  }